condition mean min max ZT0-3 48.05 48.05 48.05 ZT4-7 3.8 3.8 3.8 ZT8-11 37.550000000000004 37.550000000000004 37.550000000000004 ZT12-15 74.75 74.75 74.75 ZT16-19 58.849999999999994 58.849999999999994 58.849999999999994 ZT20-23 54.5 54.5 54.5